openssh bugs - Sep 2015 - [Bug 1457] X11 Forwarding doesn't work anymore on a solaris 10 host where ipv6 has not been enabled

https://bugzilla.mindrot.org/show_bug.cgi?id=1457

--- Comment #9 from Ian Donaldson <iand at ekit-inc.com> ---
Ok agreed, my patch reopens that CVE.

The problem is that on Solaris 9 and Solaris 10 if you don't
have IPv6 addresses configured, getaddrinfo() returns both AF_INET and
AF_INET6 entries, and it returns AF_INET6 *first*.

An attempted bind() to an AF_INET6 address on a system
without IPv6 addresses configured returns EADDRNOTAVAIL, and the
distributed code will not try the AF_INET (IPV4) bind at all; my patch
allows it to continue on, but as you say that creates 
a potential security issue.

What probably should happen in this code is that the bind result
should be checked for EADDRNOTAVAIL error and not consider that
a bail-out case; keep going anyway with other bind attempts; and
that way an IPv4 only system will be happy and bind there.

Anyway a workaround on such systems is to set this in sshd_config

   AddressFamily inet

so I've undone my change and done that instead.   

Case closed I guess.

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